Ultra-endurance running may not be good for the heart, study suggests

In 2009, a study was conducted in the UK to assess the effects of running in ultra-endurance races. Typically aimed at super-fit and experienced athletes, these races are held over distances exceeding 50 miles (80 kilometres). The conclusions suggest that some damage is likely to occur to the heart muscle of competitors, while 12 percent of the study group showed signs of significant cardiac damage.

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